Grading machine



-W. E. MCCAIN.

GRADING MACHINE.- APPLICATION FILED JAN. 12, 1920.

1,406,743. Patented Feb. 14, 1922.

7 I I INVENTOR UNITED STATES PATENT OFFICE.

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GRADING MACHINE.

Specification of Letters Patent.

Patented Feb. 14, 1922.

Application filed January 12, 1920. Serial No. 350,952.

To all whom it may concern:

Be it known that I, WILLIAM E. MCCAIN, a citizen of the United States,residing at Erie, in the county of Erie and State of Pennsylvania, haveinvented new and useful Improvements in Grading Machines, of which thefollowing is a specification.

This grading machine is so designed as to make available steam shovelsas ordinarily constructed. It is designed to give a wide range ofoperation especially w1th relation to shallow grading such as isencountered in ordinary road .work and in renewing pavements.

The invention is illustrated in the accomshovel construction.

An auxiliary boom 11 preferably in the form of an I-beam is secured to abracket 12 and the bracket 12 is pivotally mounted on a pin 13 which pinpreferabl also forms a pivotal mountin or the 00m 5. The bracket 12ex'ten s outwardly far enough to permit the swinging of the platform 4with relation to the frame and parts of the machine. A dipper 14 iscarried by hangers 15 which are provided with the wheels 16 mountedbetween the flanges 17 of the I- beam or boom 11. The dipper is providedwith the usual oints l8 and has a-swinging bottom 19 which is preferablytripped from the rear of the dip er.

A driving or pull-out line 20is operated from the drum 21 on theplatform and extends from a sheave 22 on the main boom 5 around a sheave23 on the auxiliary boom,

over a sheave 24 at the outer end of the auxwith the parts as shown inthe drawing the boom 11 is swung to the portion of the work desired tobe operated upon by swinging the platform in the usual manner of steamshovels. The dipper is driven into the work by the pull-out line 20which forces the dipper along the boom 11. The boom and In consequencethe dipper is held to its work through the, action of the dipper stickand' the crowding engine 7. When the dipper is filled it is carried tothe end of the auxillary boom 11 and the auxiliary boom is liftedthrough the action of the dipper stick and the dipper swung .over thewagon or "other receptacle and dumped by dropping the bottom 19. Thedipper is then permitted to run back on the boom by gravity and theauxiliary boom is lowered to the horizontal position and swung to theposition of the work and the operation is re eated.

It will be noted that] this construction while giving a practicallydirect thrust to the dipper through the horizontal posit-ioning of theboom also permits of a setting and holding of the auxiliary boom to thework by means of the dipper stick. Further it makes applicable theordinary steam shovel with very little change so that it forms merely anattachment for a steam shovel and it also provides a mechanism whichoperates in a manner so nearly analogous to the ordinary steam shovelthat an operator familiar w1th steam shovel practice has no difficultyin immediately operating the grader soformed. a

What I claim as new is 1. In a grading machine, the combination of aplatform; a boom pivotally mounted upon the platform and extending fromthe platform; a dipper having a cutting edge directed away from theplatform and movable along the boom; a. dipper stick actuating the boomto raise and lower the outer end of the boom; a crowding engineoperating on the dipper stick; a mounting for the crowding engine; adrum on the platform; and a line extending from the drum to the dipperfor actuating the dipper alon the boom.

2. In a grading machine, the combination of a platform; a boom pivotallymounted upon the platform and extending from the platform; a dipperhavin a cutting edgedirected away from the p atform an movable'alon theboom; a dipper stick actuating the com to raise and. lower the lot outerend of the boom; a crowding engine operating on the dipper stick; amounting for the crowding engine; a drum on the platform; and a lineextending from the drum to the dipper by way of the end of the boom.

3.-In a grading machine, the combination of a swinging platform; a boomivotally mounted upon the platform an extending from the platform; adipper having a cuttin edge directed away from the platform an movablealong the boom; a dip er stick actuating the boom to raise and lower theouter end of the boom; 3. crowding engine operating on the dipper stick;a mounting for the cro'wding engine;

a drum on the platform; and a line extending from the drum to the dipperfor actuatmg the dipper along the boom.

4. In a grading machine, the combination of a platform; a main boomextending from the platform; an auxiliary boom mounted below the mainboom; a dipper 'movablealong the auxiliary boom; a drum on the platform;a line extending from the drum to the dipper; a dipper stick mounted onthe main boom andsecured to the auxiliary boom; and a crowding enginemounted on the main boom and acting on the dipper stick. Y

5. In a grading machine, the combination of a platform; a main boomextending from the latform; an auxiliary boom mounted be ow the mainboom; a dipper iary'boom; and a crowding engine mounted on themain boomand acting on the dipper stick.

6. In a grading machine, the combination of a swinging platform; a mainboom extending from the platform; an auxiliary boom mounted below themain boom; a dipper'movable along the auxiliary boom;

a drum on the platform; a line extending y from the drum to the dipper;a dipper stick mounted on the main boom and secured to the auxiliaryboom; and a crowding engine mounted on the main boom and acting on thedipper stick. 5

' 7. In a grading machine, the combination of a platform; a main boomextending from the platform; an auxiliary boom mounted below the mainboom; a di per movable along the auxiliary boom; a rum on the platform;a line extending from the drum to the dipper; a dipperv stick mounted onthe main boom and secured to the auxiliary boom; a crowding enginemounted on the main boom and acting onthe dipper stick; and pivotalmountings for said booms, said mountings being adjacent.

In testimony whereof I have hereunto set my hand. WILLIAM E. MCCAIN.

